Micrometer



W. KNEISSLER Feb. 13, 1951 MICROMETER Filed June 22. 194e f Il Patented Feb. 13, 1951 UNITED sr'rns germ orricr.

MICROMETER Walter Kneissler, Elizabeth, N. J.

Application .lune 22, 1946, Serial No. 678,532 7 claims. (c1. ss-lav) This invention relates to an improvement in micrometers. n

The object of` my invention is to provlde .a

micrometer whereby measurements may be taken n which were not possible to take with the conventional micrometer. To this end, one of the micrometer arms may be fitted with one of a series of replaceable stops to suit the article to be measured.

With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

In the drawings,

Fig. 1 is a side elevation, partly in section.

Fig. 2 is an end elevation.

Fig. 3 is a sectional top plan viewv through the y line -y, of Fig. l.

Fig. 4 are perspective views of various replaceable stop elements.

Fig. 5 is a side elevation, partly in section, of a modication.

Fig. 6 is an end elevation, partly in section, of the modication shown in Fig. 5, on line o p.

Fig. '7 are perspective views'of replaceable stop elements for use with the modication shown in Fig. 5.

Figs. 8 and 9 illustrate the method of use of my micrometer.

Fig. 10 is a side elevation of another form of replaceable stop elements.

Referring to the drawings, i designates a b asemember of a U-shaped frame having the relatively fixed arms 2 and 3A of different lengths. The longer arm 3 terminatesin an enlarged boss 4 apertured to receive a conventional micrometer measuring screw 5 mounted in a bushing retained in the boss by the set screw 6.

The shorter Xed arm 2 of the U-shaped frame has a smooth or flat face 2' opposed to which is a clamp-element l, the inner face of which is formed with a plurality of stop-element locating recesses, one of which (8) is of rectangular cross section while another (9) is of V-shaped cross section. The rectangular recess 8 is adapted to receive and hold the rectangularly bodied replaceable stop elements a, b, c and d while the V-shaped recess S retains the cylindrical stop element e.

The clamp-element 1 is secured upon one end of a supporting bar l@ housed for axial movement in the base member I and is restrained against rotation by a guide pin il secured in the clamp element and entering a guide-aperture in the base member l. The other end i2 of the supportingbar l0 is screw-threaded to receive a clamping nut I 3 by which, through. the clampelement I, the replaceable stop element is rigidly held against the outer face 2 of the arm 2. The clamp-element l is normally urged outwardly into open position from the arm 2 to receive a stop element by the spring ill, embracing a reduced portion of the supporting bar I!! within the base l.

It will bey observed that the exposed measuring portions of the replaceable stops ad are continuous and flush with those portions of the stops held between the clamp 'E and contacting the arm 2 so that when readings are taken on the micrometer screw 5, the measurement will be the distance between the stop and the end of the movable micrometer screw 5. It is understood, of course, that the initial zero setting of the micrometer screw 5 will be obtained by loosening 'the set-screw 6-and shifting the micrometer unit endwise in the boss Il of the U-shaped frame.

It will be'further observed that when either Y of the stops a-d are clamped between the flat arm 2 and the clamp 'i they are disposed normal to the micrometer screw 5.

In the modification shown in Figs. 5 and 6, the movable micrometer screw 5 is held against rotation by a key p carried bythe head 4 and entering a keyway 'r in the screw 5. The parts are held together by the collar I5 secured upon the arm 3 vby a fastening screw I9 and having a portion I6 entering an annular groove Il in the headvl8. In the modification, the movable measuring element 5 is iitted to receive a replaceable cylindrical stop element, such as f, g or h, and retained thereon by the fastening screw 20.

In the replaceable stop element shown in Fig. 10, the offset end of the element n is apertured to receive a rod 2l one end 22 of `which is pointed for use in measuring the depth of a center punch mark while the other end 23 is thin wedge-shaped for use in measuring the depth of graduated cuts in a steel measuring scale. The rod 2l is retained in the element 1L by the set screw 2li.

My micrometer is used as follows: f

When it is desired to measure the thickness of the wall z of the article shown in Fig. 8, a replaceable stop element a, suiiiciently thin at its 3 measuring end to enter the opening adjacent thereto, is clamped in the arm 2 and inserted in the opening while the movable measuring element of the micrometer is brought into contact with the outer or free face of the Wall e and the micrometer distance read in the usual manner.

When it is desired to measure the thickness of the wall m between the apertures 7c and Z of the article shown in Fig. 9, a replaceable cylindrical stop element, such as e', is inserted in the clamp arm 1 of the modication shown in Fig. 5 which in cooperation with the other cylindrical stop element h mounted upon the movable micrometer element, when both are inserted, respectively, in the apertures lc and l, will, when properly contacted, permit reading of the micrometer measurement.

Having thus set forth the nature of the invention, what I claim herein is:

l. In a micrometer, a U-shaped member having a base and spaced arms arranged in parallelism and of unequal length, a micrometer screw mounted in the longer one of said arms, a clampelement carried by the base of said U-shaped member and adjustably movable toward and from said other arm, and a stop disposed normal to said micrometer screw and replaceably secured to said other arm by said clamp element and extending into the path of movement of said micrometer screw.

2. In a micrometer, a U-.shaped member having a base and spaced arms of unequal length arranged in parallelism, a micrometer screw mounted in the longer one of said arms, a clamp element carried by the base of said U-shaped member and adjustably movable toward and from the other arm and provided in its face proximate to said other arm with a stop-element-locating recess, and a stop replaceably secured normal to said micrometer screw in said recess by said clamp element and extending into the path of movement of said micrometer screw.

3. In a micrometer, a U-shaped member having a base and spaced arms of unequal length arranged in parallelism, a micrometer screw mounted in the longer one of said arms, a clamp element carried by the base of said U-shaped member adjustably movable toward and from said other arm, and means provided in said clamp element for locating thereon any one of a plurality of stop-elements each provided with a different contour and each adapted to be secured between said arm and clamp element and extending into the path of movement of said micrometer screw.

4,. In a micrometer, in combination, a basemember having two relatively Xed arms of diff ferent lengths arranged in parallelism, a micrometer screw mounted in the longer one of said arms, a stop-member secured to the shorter one of said arms and disposed normal to said micrometer screw, a bar mounted for endwise movement in said base-member, a clamp-arm carried by said bar for holding said stop against the shorter one of said arms, and means for retaining said clamp arms in alignment 'with said shorter arm.

5. In a micrometer, a U-shaped member having a base and spaced arms arranged in parallelism and of unequal lengths, a micrometer screw mounted in the longer one of said arms, a clamp y element carried by the base of said U-shaped liliv member and adjustably movable toward and from `said other arm, a -lrst stop disposed normal to said micrometer screw and replaceably secured to said other arm by said clampy element and a second stop carried by said screw and disposed parallel to said rst stop.

6. In a. micrometer, a U-shaped member having a base and spaced arms arranged in parallelism, one arm of which has a relatively flat face, a micrometer screw mounted in the other arm, a clamp element carried by the base of said-U-shaped member and adjustably movable toward and from said at faced arm, said clamp element having a rectangular recess to receive a correspondingly shaped stop element and a Vshaped recess to receive a cylindrical stop element and extending into the path of movement of said micrometer screw.

7. In a micrometer, a member having a base and an arm extending therefrom, a micrometer screw mounted in said arm, a clamping means supported by the base comprising a movable clamping element adjustable axially or the base and a fixed portion, a stop replaceably secured between the fixed and movable clamping means and extending into the path of movement of said micrometer screw.

A WALTER KNEISSLER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 515,235 Lavigne Feb. 20, 1894 925,280 Bosworth June 15, 1909 1,070,816 Kunik Aug. 19, 1913 1,176,567 Kamowske Mar. 21, 1916 1,186,364 Allington June 6, 1916 1,370,310 Gfustavson Mar. 1, 1921 1,668,248 Olson May 1, 1928 1,910,467 I-Ieckersdori et al. May 23, 1933 FOREIGN PATENTS Number Country Date 22,781 France Feb. 26, 1921 

